Here is the full list of all 40 Roundabout achievements.
Purchase a pet eagle.
Unlocked the Beary Nice Music Box.
In "Farming Simulator 1977", complete your farming in under 40 seconds.
In "Death from Above", survive for 30 seconds.
Die 360 times.
Unlocked the Traffic Coner.
Survive the Mountain Fair Demolition Derby without exploding.
In "The Great Hunt", find 6 regions.
Reach 100% completion on a mission.
Unlocked the Reverser Wheel.
Drove straight for Beth.
Make a huge mistake.
In "Destruction Derby", take out 8 cars.
Unlocked the Inflatiboat For Cars.
In "Ball Bouncers", bounce the ball at least 12 times.
Follow a lady into the big smoke.
Purchase some property.
Purchase something from The Chrome Dome.
Collect every star in a single ride.
View the "How's Your Driving" screen outside of the DMV ride. Useful, isn't it?
Unlocked the Pickup Finder.
Unlocked the Multiplier Freezer.
Stand still for a minute of silence at The Memorial.
Honk your horn 500 times, then honk your horn 500 more.
Revolve over 53,596 times.
Aggressively warn a dozen pedestrians with the Trafffic Coner.
Complete your first eSports Speedrun Challenge.
Get a better eSports Speedrun Time than the No Goblin team.
In "Run Like Crazy", get 150 yards away.
In "Limocide", take out 50 pedestrians.
Reach a 35x multiplier.
Collect every Cash Stash.
Accomplish every Sick Jump.
Discover all of the horns.
Purchase every hat and paint job.
Collect every star in every ride.
Purchase every property.
Reach 100% completion for the entire game.
Complete an eSports Speedrun without exploding.
Drive the entire "classic" length of Desert Limo without crashing.